Sony CDX-GT440U Service Manual page 27

• IC Pin Function Description
MAIN BOARD (2/3) IC401 MB90F882PF-G-111E1 (SYSTEM CONTROL)
Pin No. Pin Name
1 CYRIL_SEL
2 B-OUT_SEL
3 COL SW_SEL
4 ILLUMI_SEL
5, 6 NCO
7 NOSE_SW
8 to 10 NCO
11 RE_IN0
12 RE_IN1
13 X_OUT
14 X_IN
15 VCC
16 VSS
17 C
18 UNISI
19 UNISO
20 UNISCK
21 USB_ON
22 I2C_SIO
23 I2C_SCK
24 USB_OVER
25 BUS_ON
26 SYS_RST
27 CD_ON
28 CDM_ON
29 ACC_IN
30 TEL_ATT
31 ATT
32 AVCC
33 AVRH
34 RC_IN1
35 AVSS
36 QUALITY
37 VSM
38 SA_IN
39 KEY_IN1
40 KEY_IN0
41 RC_IN0
42, 43 NCO
44 VSS
45 KEY_ACK0
46 KEY_ACK1
47 EXTATT_XEN
48 LCD_CE
49 LCD_SO
50 LCD_SCK
51 MOD2
52 MOD1
53 MOD0
54 RESET
55 AREA_SEL2
56 AREA_SEL1
57 AREA_SEL0
58 WAKE_UP
I/O
Cyril select signal input (L: No cyril select (CDX-GT440U/GT444U), H: Cyril select (CDX-
I
GT447UE))
I Black out setting select signal input (L: No black out)
I Key illumination initial color setting select signal input (H: Blue)
I Key illumination voltage setting select signal input (H: 10.4 V)
O Not used. (Open)
I Front panel detach/attach detect signal input (L: with front panel, H: without front panel)
O Not used. (Open)
I Rotary encoder signal input 0
I Rotary encoder signal input 1
O Low speed operation clock signal output (32.768 kHz)
I Low speed operation clock signal input (32.768 kHz)
― Power supply pin (+3.3 V)
― Ground
― Regulator reference capacitor connecting pin
I SONY-BUS data input (Fixed at L in this set)
O Not used. (Open)
O Not used. (Open)
O USB over current detect IC control signal output
I/O IIC serial data input/output
O IIC serial clock signal output
I USB over current detect signal input
O BUS ON signal output (Fixed at H in this set)
O System reset signal output
I CD mechanism servo power supply control request signal input
I CD mechanism deck power supply control request signal input
I Accessory power supply detect signal input
I Telephone attenuator detect signal input (AEP, UK, Russian model)
O Audio mute control signal output
― A/D converter power supply pin (+3.3 V)
― A/D converter external reference power supply pin (+3.3 V)
I Rotary commander shift key signal input 1
― Ground for A/D converter
I Not used. (Open)
I S meter voltage detect signal input
I Spectrum analyzer DC input
I Key signal input 1
I Key signal input 0
I Rotary commander shift key signal input 0
O Not used. (Open)
― Ground
I Key acknowledge detect signal input (Rotary commander)
I Key acknowledge detect signal input (Front panel)
L is sent when electronic volume IC has the status of CD/USB (H is sent when it has the status
O
of other source)
O LCD driver chip enable signal output
O LCD driver serial data output
O LCD driver serial clock signal output
I Micon operation mode setting signal input (active: L)
I Micon operation mode setting signal input (Fixed at H in this set)
I Micon operation mode setting signal input (active: H)
I Reset signal input
I Destination setting pin 2 (L: CDX-GT440U/GT444U, H: CDX-GT447UE)
Destination setting pin 1 (L: CDX-GT440U: AEP, UK, Russian model/GT444U, H: CDX-
I
GT440U: US model/GT447UE)
I Destination setting pin 0 (L: US model, H: AEP, UK, Russian model)
O CD mechanism deck micon wake up signal output
CDX-GT440U/GT444U/GT447UE
Description
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